JPH0755071B2 - Motor control device - Google Patents
Motor control deviceInfo
- Publication number
- JPH0755071B2 JPH0755071B2 JP61312126A JP31212686A JPH0755071B2 JP H0755071 B2 JPH0755071 B2 JP H0755071B2 JP 61312126 A JP61312126 A JP 61312126A JP 31212686 A JP31212686 A JP 31212686A JP H0755071 B2 JPH0755071 B2 JP H0755071B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- circuit
- discharge
- regenerative
- discharge circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000001514 detection method Methods 0.000 claims description 32
- 230000001172 regenerating effect Effects 0.000 claims description 30
- 239000003990 capacitor Substances 0.000 claims description 23
- 238000009499 grossing Methods 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 5
- 238000007599 discharging Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/06—Controlling the motor in four quadrants
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Stopping Of Electric Motors (AREA)
- Inverter Devices (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、例えばACサーボドライバ等の制動時にモータ
より駆動回路へ回生される電圧を軽減するための放電回
路、この放電回路を保護する保護回路、この保護回路の
動作後は駆動回路を停止状態にするための手段を備えた
モータ制御装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge circuit for reducing a voltage regenerated from a motor to a drive circuit during braking of an AC servo driver or the like, a protection circuit for protecting this discharge circuit, The present invention relates to a motor control device provided with means for bringing a drive circuit into a stopped state after the operation of the protection circuit.
従来の技術 一般にACサーボドライバにおいて、モータに制動をかけ
る場合、モータより駆動回路へ電圧が回生され、駆動回
路の入力にある平滑コンデンサの電圧が上昇し、その電
圧がコンデンサの定格を越える場合がある。Conventional technology Generally, in the AC servo driver, when braking the motor, voltage is regenerated from the motor to the drive circuit, the voltage of the smoothing capacitor at the input of the drive circuit rises, and the voltage may exceed the rating of the capacitor. is there.
このため、平滑コンデンサの電圧が上昇した場合、この
電圧を検出し、放電回路に放電させて平滑コンデンサの
電圧上昇を制限する方法が知られている 以下図面を参照しながら、従来のモータ制御装置につい
て説明する。For this reason, when the voltage of the smoothing capacitor rises, there is known a method of detecting this voltage and discharging the discharge circuit to limit the voltage rise of the smoothing capacitor. Will be described.
第３図は従来のモータ制御装置の構成を示すものであ
る。第３図において、１は交流電源、２は整流ダイオー
ド、３は整流ダイオード２の出力を平滑する平滑コンデ
ンサ、４は平滑コンデンサ３の端子電圧を入力とするモ
ータ駆動回路、５はサーボモータ、６は駆動回路４の入
力に接続された回生電圧検出回路、７は回生電圧放電回
路、８は放電回路用保護回路、９は過電圧検出回路、10
は電圧低下検出回路である。FIG. 3 shows the configuration of a conventional motor control device. In FIG. 3, 1 is an AC power source, 2 is a rectifying diode, 3 is a smoothing capacitor that smoothes the output of the rectifying diode 2, 4 is a motor drive circuit that receives the terminal voltage of the smoothing capacitor 3, 5 is a servo motor, 6 Is a regenerative voltage detection circuit connected to the input of the drive circuit 4, 7 is a regenerative voltage discharge circuit, 8 is a discharge circuit protection circuit, 9 is an overvoltage detection circuit, 10
Is a voltage drop detection circuit.
以上のように構成されたモータ制御回路について、以下
にその動作を説明する。The operation of the motor control circuit configured as described above will be described below.
第４図は回生電圧検出回路６、過電圧検出回路９、電圧
低下検出回路10の電圧検出レベルVa,Vb,Vcを示したもの
である。同図でVDCは平滑コンデンサ３の端子電圧であ
る。FIG. 4 shows the voltage detection levels V a , V b , and V c of the regenerative voltage detection circuit 6, the overvoltage detection circuit 9, and the voltage drop detection circuit 10. In the figure, V DC is the terminal voltage of the smoothing capacitor 3.
モータが制動状態になるとVDCは徐々に上昇しVDC＞V
a（Vaは放電開始電圧）となったとき回生電圧検出回路
６が動作し、回生電圧放電回路７を平滑コンデンサ３に
接続しVDCの低減が図られ定常状態にもどる。瞬時的な
電圧の上昇によりVDC＞Vb（Vbは過電圧保護しきい電
圧）となったときは過電圧検出回路９が動作し、駆動回
路４を停止状態としVDCを低減する。電圧低下検出回路1
0はモータの起動時等に平滑コンデンサ３の電圧がVDC＜
Vcとなったときも駆動回路４を停止し平滑コンデンサ３
の電圧が設定値よりも低下しないように働く。When the motor is in the braking state, V DC gradually rises and V DC > V
When a (V a is the discharge start voltage) is reached, the regenerative voltage detection circuit 6 operates and the regenerative voltage discharge circuit 7 is connected to the smoothing capacitor 3 to reduce V DC and return to the steady state. When VDC > Vb ( Vb is an overvoltage protection threshold voltage) due to an instantaneous increase in voltage, the overvoltage detection circuit 9 operates to stop the drive circuit 4 and reduce VDC . Voltage drop detection circuit 1
0 means that the voltage of the smoothing capacitor 3 is V DC <when the motor is started.
Even when it reaches V c , the drive circuit 4 is stopped and the smoothing capacitor 3
It works so that the voltage of does not drop below the set value.
発明が解決しようとする問題点 ところが従来例の装置では、回生電圧放電回路７を長時
間動作させると、回生電圧放電回路７を保護する放電回
路用保護回路８が働き、それ以後は、VDC＞Vbとなるま
で平滑コンデンサ３の電圧が上昇しないと平滑コンデン
サ３の電圧上昇を制限できない欠点があった。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the device of the conventional example, when the regenerative voltage discharge circuit 7 is operated for a long time, the discharge circuit protection circuit 8 that protects the regenerative voltage discharge circuit 7 operates, and thereafter, V DC There is a drawback that the voltage rise of the smoothing capacitor 3 cannot be restricted unless the voltage of the smoothing capacitor 3 rises until> V b .
本発明は上記問題点に鑑み、放電回路の保護回路が動作
した場合、その構成要素を増すことなく、駆動回路を停
止状態にさせて安全性を向上させたモータ制御装置を提
供するものである。In view of the above problems, the present invention provides a motor control device in which, when a protection circuit for a discharge circuit operates, the drive circuit is stopped and the safety is improved without increasing the number of constituent elements. .
問題点を解決するための手段 上記問題点を解決するために本発明のモータ制御装置
は、平滑コンデンサの電圧の検出を、放電回路と直列に
接続された低インピーダンスの保護回路を経由して行う
回生電圧検出回路を設け、保護回路の動作後は、駆動回
路を停止状態にさせるものである。Means for Solving the Problems In order to solve the above problems, the motor control device of the present invention detects the voltage of the smoothing capacitor via a low-impedance protection circuit connected in series with the discharge circuit. A regenerative voltage detection circuit is provided, and the drive circuit is stopped after the operation of the protection circuit.
作用 本発明は上記の構成により平滑コンデンサの放電回路の
保護回路が動作したときは、駆動回路が停止状態となる
ため、平滑コンデンサの電圧が一定の設定値を越えなく
なる。Action According to the present invention, when the protection circuit for the discharge circuit of the smoothing capacitor operates according to the above configuration, the drive circuit is stopped, so that the voltage of the smoothing capacitor does not exceed a certain set value.
実施例 以下本発明の実施例のモータ制御装置について、図面を
参照しながら説明する。Embodiment Hereinafter, a motor control device according to an embodiment of the present invention will be described with reference to the drawings.
第１図は本発明の実施例におけるモータ制御装置の構成
を示すものである。第１図において、１は交流電源であ
り、５はサーボモータである。FIG. 1 shows the configuration of a motor control device according to an embodiment of the present invention. In FIG. 1, 1 is an AC power supply and 5 is a servo motor.
整流ダイオード２と平滑コンデンサ３で、モータ駆動回
路14へ直流電圧を供給する整流回路を構成し、低インピ
ーダンスの回生電圧放電回路７と放電回路用保護回路８
で回生電圧放電部を構成し、回生電圧検出回路16と過電
圧検出回路19と電圧低下検出回路20より状態判断部を構
成している。The rectifier diode 2 and the smoothing capacitor 3 form a rectifier circuit that supplies a DC voltage to the motor drive circuit 14, and a low impedance regenerative voltage discharge circuit 7 and a discharge circuit protection circuit 8 are provided.
Constitutes a regenerative voltage discharging section, and the regenerative voltage detecting circuit 16, the overvoltage detecting circuit 19 and the voltage drop detecting circuit 20 constitute a state judging section.
放電回路用保護回路８と回生電圧放電回路７とは高電位
側から順に直列接続されて平滑コンデンサ３に並列に接
続され、その中間接続部を状態判断部の検出用電圧とし
て出力する。放電回路用保護回路８は回生電圧放電回路
７の連続動作時に加熱事故が生じるのを防ぐため、回生
電圧放電回路７を強制遮断する。回生電圧検出回路16
は、中間接続部の出力電圧を入力とし、これが放電開始
電圧を越えたことを条件として回生電圧放電回路へ動作
指令を発するものである。過電圧検出回路は、中間接続
部電圧を入力とし、過電圧保護しきい電圧を越えたこと
を条件としてモータ駆動回路14へ停止命令を発するもの
である。電圧低下検出回路20は、放電回路用保護回路８
の動作に従い、中間接続部電圧が所定電圧以下を条件と
してモータ駆動回路へ停止指令を発するものである。The discharge circuit protection circuit 8 and the regenerative voltage discharge circuit 7 are connected in series in order from the high potential side and connected in parallel to the smoothing capacitor 3, and the intermediate connection part thereof is output as a detection voltage for the state determination part. The discharge circuit protection circuit 8 forcibly shuts off the regenerative voltage discharge circuit 7 in order to prevent a heating accident from occurring during continuous operation of the regenerative voltage discharge circuit 7. Regenerative voltage detection circuit 16
Is an input of the output voltage of the intermediate connection portion, and issues an operation command to the regenerative voltage discharge circuit on condition that the output voltage exceeds the discharge start voltage. The overvoltage detection circuit receives the intermediate connection voltage as an input and issues a stop command to the motor drive circuit 14 on condition that the overvoltage protection threshold voltage is exceeded. The voltage drop detection circuit 20 includes a discharge circuit protection circuit 8
According to the above operation, the stop command is issued to the motor drive circuit on condition that the voltage of the intermediate connection portion is equal to or lower than the predetermined voltage.
以上のように構成されたモータ制御回路について、その
動作を説明する。The operation of the motor control circuit configured as described above will be described.
第２図は本発明の動作説明図である。第２図に示すよう
にモータが制動状態になると回生電圧VDCは徐々に上昇
し、中間接続部電圧VDC1もVDCVDC1で上昇する。FIG. 2 is an operation explanatory diagram of the present invention. As shown in FIG. 2, when the motor is in the braking state, the regenerative voltage V DC gradually rises and the intermediate connection voltage V DC1 also rises at V DC V DC1 .
VDC1＞Va（Vaは放電開始電圧）となると回生電圧検出回
路16が動作し放電回路用保護回路８と回生電圧放電回路
７とを平滑コンデンサ３に接続しVDCの低減を図る。When V DC1 > V a (V a is the discharge start voltage), the regenerative voltage detection circuit 16 operates to connect the discharge circuit protection circuit 8 and the regenerative voltage discharge circuit 7 to the smoothing capacitor 3 to reduce V DC .
次に、VDC1＞Vaの状態が長時間続くと放電回路用保護回
路８が回生電圧放電回路７の平滑コンデンサ３への接続
を強制遮断する。以上の動作によりVDC1＝０となり、電
圧低下検出回路20は、放電回路用保護回路８の動作に従
い、中間接続部電圧が所定電圧以下となりモータ駆動回
路へ停止指令を発する。Next, if the state of V DC1 > V a continues for a long time, the discharge circuit protection circuit 8 forcibly disconnects the regenerative voltage discharge circuit 7 from the smoothing capacitor 3. With the above operation, V DC1 = 0, and the voltage drop detection circuit 20 outputs the stop command to the motor drive circuit when the voltage of the intermediate connection portion becomes the predetermined voltage or less according to the operation of the discharge circuit protection circuit 8.
発明の効果 以上のように従来例では、放電回路の保護回路が動作後
でも、平滑コンデンサの端子電圧が電圧低下検出回路の
電圧検出レベルと過電圧検出回路の電圧検出レベルの間
の通常運転状態の電圧で維持されれば、モータ駆動回路
は動作しつづけるのに対して、本発明では放電回路の保
護回路が動作した後では、モータ駆動回路の動作を停止
させ、駆動回路としての安全性を高めることができる。As described above, in the conventional example, even after the protection circuit of the discharge circuit is activated, the terminal voltage of the smoothing capacitor is kept in the normal operation state between the voltage detection level of the voltage drop detection circuit and the voltage detection level of the overvoltage detection circuit. If the voltage is maintained, the motor drive circuit continues to operate, whereas in the present invention, after the protection circuit of the discharge circuit operates, the operation of the motor drive circuit is stopped and the safety of the drive circuit is increased. be able to.
第１図は本発明の実施例におけるモータ制御装置の構成
図、第２図は第１図の動作説明図、第３図は従来例のモ
ータ御装置の構成図、第４図は第３図の動作説明図であ
る。 １……交流電源、２……整流ダイオード、３……平滑コ
ンデンサ、５……サーボモータ、７……回生電圧放電回
路、８……放電回路用保護回路、14……モータ駆動回
路、16……回生電圧検出回路、19……過電圧検出回路、
20……電圧低下検出回路。FIG. 1 is a configuration diagram of a motor control device in an embodiment of the present invention, FIG. 2 is an operation explanatory diagram of FIG. 1, FIG. 3 is a configuration diagram of a conventional motor control device, and FIG. 4 is FIG. FIG. 7 is an operation explanatory diagram of FIG. 1 ... AC power supply, 2 ... Rectifier diode, 3 ... Smoothing capacitor, 5 ... Servo motor, 7 ... Regenerative voltage discharge circuit, 8 ... Discharge circuit protection circuit, 14 ... Motor drive circuit, 16 ... … Regenerative voltage detection circuit, 19 …… Overvoltage detection circuit,
20 …… Low voltage detection circuit.
Claims (1)
コンデンサからなりモータ駆動回路へ直流電圧を供給す
る整流回路と、放電回路用保護回路と回生電圧放電回路
からなる回生電圧放電部と、回生電圧検出回路と過電圧
検出回路と電圧低下検出回路からなる状態判断部とで構
成されるモータ制御装置であって、 放電回路用保護回路と回生電圧放電回路とは高電位側か
ら順に直列接続されて平滑コンデンサに並列に接続さ
れ、その中間接続部を状態判別部の検出用電圧として出
力するものであり、 放電回路用保護回路は、回生電圧放電回路の連続動作時
に加熱事故が生じるのを防ぐため、回生電圧放電回路を
強制遮断するものであり、 回生電圧検出回路は、前記中間接続部の出力電圧を入力
とし、これが放電開始電圧を越えたことを条件として回
生電圧放電回路へ動作指令を発するものであり、 過電圧検出回路は、中間接続部電圧を入力とし、過電圧
保護しきい電圧を越えたことを条件としてモータ駆動回
路へ停止命令を発するものであり、 電圧低下検出回路は、放電回路用保護回路の動作に従
い、中間接続部電圧が所定電圧以下を条件としてモータ
駆動回路へ停止命令を発するものであり、 上記設定電圧が、過電圧保護しきい電圧＞放電開始電圧
＞電圧低下検出回路の所定電圧の関係で設定されるもの
である モータ制御装置。1. A motor drive circuit, a rectifier circuit comprising a rectifying diode and a smoothing capacitor for supplying a DC voltage to the motor drive circuit, a regenerative voltage discharge section comprising a discharge circuit protection circuit and a regenerative voltage discharge circuit, and a regenerative voltage. A motor control device that includes a detection circuit, an overvoltage detection circuit, and a state determination unit that includes a voltage drop detection circuit, in which the discharge circuit protection circuit and the regenerative voltage discharge circuit are connected in series in order from the high potential side and smoothed. It is connected in parallel to the capacitor, and its intermediate connection is output as the detection voltage of the status determination unit.The discharge circuit protection circuit prevents heating accidents during continuous operation of the regenerative voltage discharge circuit. The regenerative voltage discharge circuit is forcibly cut off, and the regenerative voltage detection circuit receives the output voltage of the intermediate connection as an input, and the condition is that this exceeds the discharge start voltage. Then, the operation command is issued to the regenerative voltage discharge circuit, and the overvoltage detection circuit receives the intermediate connection voltage as an input and issues a stop command to the motor drive circuit on condition that the overvoltage protection threshold voltage is exceeded. Yes, the voltage drop detection circuit issues a stop command to the motor drive circuit according to the operation of the discharge circuit protection circuit if the voltage at the intermediate connection section is equal to or lower than the predetermined voltage.The above set voltage is the overvoltage protection threshold voltage. > Discharge starting voltage> The motor control device is set in the relation of the predetermined voltage of the voltage drop detection circuit.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61312126A JPH0755071B2 (en) | 1986-12-26 | 1986-12-26 | Motor control device |
| PCT/JP1987/001019 WO1988005225A1 (en) | 1986-12-26 | 1987-12-23 | Motor controller |
| GB8819149A GB2207569B (en) | 1986-12-26 | 1987-12-23 | Motor control apparatus. |
| US07/254,653 US4967133A (en) | 1986-12-26 | 1987-12-23 | Motor control apparatus |
| DE19873790865 DE3790865T (en) | 1986-12-26 | 1987-12-23 | |
| DE3790865A DE3790865C2 (en) | 1986-12-26 | 1987-12-23 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61312126A JPH0755071B2 (en) | 1986-12-26 | 1986-12-26 | Motor control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63167692A JPS63167692A (en) | 1988-07-11 |
| JPH0755071B2 true JPH0755071B2 (en) | 1995-06-07 |
Family
ID=18025562
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61312126A Expired - Lifetime JPH0755071B2 (en) | 1986-12-26 | 1986-12-26 | Motor control device |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4967133A (en) |
| JP (1) | JPH0755071B2 (en) |
| DE (2) | DE3790865C2 (en) |
| GB (1) | GB2207569B (en) |
| WO (1) | WO1988005225A1 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2158782B1 (en) * | 1998-05-12 | 2002-03-01 | Mannesmann Sachs Ag | CONTROL SYSTEM AND PROCEDURE FOR A PERMANENTLY EXCITED ELECTRIC MOTOR WITH AT LEAST ONE PHASE. |
| US6078156A (en) * | 1998-10-02 | 2000-06-20 | Eastman Kodak Company | Method and apparatus for improved electronic braking of a DC motor |
| JP3511593B2 (en) * | 2000-11-10 | 2004-03-29 | 三菱電機株式会社 | Electric power steering control device |
| JP2005016958A (en) * | 2003-06-23 | 2005-01-20 | Fanuc Ltd | Motor driving device |
| DE102005009341A1 (en) | 2004-11-04 | 2006-05-18 | Diehl Ako Stiftung & Co. Kg | Circuit arrangement and method for controlling an electric motor, in particular a washing machine |
| JP2006142357A (en) * | 2004-11-22 | 2006-06-08 | Fanuc Ltd | Device for driving die cushion |
| JP4366351B2 (en) * | 2005-10-07 | 2009-11-18 | キヤノン株式会社 | Power supply control circuit, electronic device and recording apparatus |
| CN100409563C (en) * | 2007-06-11 | 2008-08-06 | 湖南巨汇科技发展有限公司 | Motor intelligent power-saving protector |
| DE102008010980A1 (en) * | 2008-02-25 | 2009-08-27 | Robert Bosch Gmbh | Method and device for discharging a high-voltage network |
| EP2433830A1 (en) * | 2010-09-28 | 2012-03-28 | Brusa Elektronik AG | Method and control for providing electrical energy from a driven alternating current synchronous machine |
| DE102011078211A1 (en) | 2011-06-28 | 2013-01-03 | Converteam Technology Ltd. | Method for operating an electrical circuit and electrical circuit |
| JP6498856B1 (en) * | 2017-07-07 | 2019-04-10 | オリンパス株式会社 | Self-propelled endoscope device and control device thereof |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3800198A (en) * | 1971-08-16 | 1974-03-26 | Gen Electric | Protection means for preventing overvoltage and undervoltage conditions in power circuits |
| US3887860A (en) * | 1972-11-15 | 1975-06-03 | Eaton Corp | Fuseless inverter |
| US3947748A (en) * | 1975-02-18 | 1976-03-30 | Eaton Corporation | Fault commutation system for static inverters |
| JPS58834B2 (en) * | 1978-01-25 | 1983-01-08 | 松下電器産業株式会社 | Induction cooker protection device |
| US4183081A (en) * | 1978-11-02 | 1980-01-08 | General Electric Company | Inverter system including commutation failure prevention scheme |
| JPS58154380A (en) * | 1982-03-09 | 1983-09-13 | Mitsubishi Electric Corp | Controller for ac elevator |
| JPS60197179A (en) * | 1984-03-16 | 1985-10-05 | Fanuc Ltd | Regenerative control system of induction motor |
| JPS6188774A (en) * | 1984-10-05 | 1986-05-07 | Mitsubishi Electric Corp | Controller for elevator |
| JPS61189178A (en) * | 1985-02-14 | 1986-08-22 | Matsushita Electric Ind Co Ltd | Regenerative resistor protecting device of inverter |
| KR900002784B1 (en) * | 1985-04-30 | 1990-04-30 | 미쓰비시전기주식회사 | Control device of AC elevator |
-
1986
- 1986-12-26 JP JP61312126A patent/JPH0755071B2/en not_active Expired - Lifetime
-
1987
- 1987-12-23 DE DE3790865A patent/DE3790865C2/de not_active Expired - Lifetime
- 1987-12-23 DE DE19873790865 patent/DE3790865T/de active Pending
- 1987-12-23 GB GB8819149A patent/GB2207569B/en not_active Expired - Lifetime
- 1987-12-23 US US07/254,653 patent/US4967133A/en not_active Expired - Lifetime
- 1987-12-23 WO PCT/JP1987/001019 patent/WO1988005225A1/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| DE3790865C2 (en) | 1990-08-23 |
| JPS63167692A (en) | 1988-07-11 |
| GB2207569A (en) | 1989-02-01 |
| GB8819149D0 (en) | 1988-10-12 |
| WO1988005225A1 (en) | 1988-07-14 |
| US4967133A (en) | 1990-10-30 |
| GB2207569B (en) | 1991-01-16 |
| DE3790865T (en) | 1989-01-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0755071B2 (en) | Motor control device | |
| WO2005090216A1 (en) | Elevator controller | |
| JPH0132760B2 (en) | ||
| JP3309494B2 (en) | Inverter power failure countermeasure circuit | |
| JP2838082B2 (en) | Elevator emergency operation device | |
| JPH0731001A (en) | Power converter for AC electric vehicle and protective operation method thereof | |
| US11984751B2 (en) | Discharge circuit and discharging method of motor drive power supply circuit, and robot controller | |
| JP2575820B2 (en) | Elevator blackout operation device | |
| KR900005993B1 (en) | Control apparatus for an electric railwey vehicle | |
| JP2000139082A (en) | How to protect the inverter | |
| JPH04161096A (en) | Inverter controller for induction motor | |
| JP2549582B2 (en) | Crane regenerative braking control circuit | |
| JPH0731135A (en) | Auxiliary power supply | |
| JPH0630597A (en) | Motor drive | |
| JPH0236796A (en) | Power converter | |
| JPH02193573A (en) | Inverter device | |
| JPS6162393A (en) | Inverter device | |
| JP2588385B2 (en) | Regenerative energy-discharge circuit of motor | |
| JP3785447B2 (en) | Elevator control device | |
| JP2635120B2 (en) | Induction machine control device | |
| JPH04109898A (en) | Power converter | |
| JPH022387B2 (en) | ||
| JPH0378356B2 (en) | ||
| JPS6330232Y2 (en) | ||
| JPH07337030A (en) | Method and apparatus for preventing overcurrent of inverter |